Float64x2List.view constructor

Changes in the Float64x2List will be visible in the byte
buffer and vice versa.
If the offsetInBytes index of the region is not specified,
it defaults to zero (the first byte in the byte buffer).
If the length is not specified, it defaults to null,
which indicates that the view extends to the end of the byte buffer.

Throws RangeError if offsetInBytes or length are negative, or
if offsetInBytes + (length * elementSizeInBytes) is greater than
the length of buffer.